wright



W'- H. WRIGHT.

vFLUID STREAM PRESSURE GOVERNOR. APPLICATION HLED MAY 9, 1911.

1,305,762. I Patented J mm 3, 1919.

m5 NORRIS PETERS ca, Puonvurno" WASNINGYON. n. cy

WILLIAM H. WRIGHT, or INDIANAPOLIS, INDIANA.

FLUID-STREAM-PRESSURE GOVERNOR.

Specification of Letters Patent.

Patented June 3, 1919.

Application filed May 9, 1917. semi No. times.

To all whom it may concern:

Be it known that I, WILLIAM H. WRIGHT, a citizen of the UnitedStates, residing at Indianapolis,in the county of Marion and State of Indiana, have invented a new and useful Fluid Stream-Pressure Governor, of which the following is a specification.

It is the object of my invention to provide a simple pressure'governor for maintaining a substantially constant pressure, whether above or below atmospheric pressure, in a fluid stream.

I do this by controlling a bleeding open ing whereby fluid may be admitted to or allowed to escape from the main fluid stream to maintain' the desired pressure in such stream; and I control this bleeding opening by a balanced valve operated by a governing gas holder which is connected to the fluid stream so that the gas holder movements are effected by changes in the pressure in the fluid stream, the gas holder being acted on in one direction by a constant force so that its movement in eitherdirection continues until the bleeding to or from the fluid stream changes the pressure in such stream so that it returns to the normal determined by such constant force. I guide the movements of the gas holder and balanced valve by a lever provided with arc-shaped segments at the ends and connected by flexible members to the moving parts, so that constant lever arms are obtained and there is a minimum of friction; and I prefer to obtain the constant force by a weight. The bleeding opening may be and ordinarily is direct to or from the atmosphere.

-My invention is especially adapted for controlling the pressure condition within a flue from a furnace, and more particularly within the flue from a coke oven, and is also well adapted for the control of the pressure of the fluid. stream discharged from a blower. V f

The accompanying drawings illustrate my invention. Figurel is a diagrammatic view showing my invention applied to the flue from a coke oven; and Fig. 2 is a similar diagrammatic. view, showing .my invention applied to a pipe carrying gaseous fluld under pressure. j

In Fig. l, the fluelO from a coke oven is shown as discharging into the base of a stack 11. It is necessary to maintain the draft substantially constant throughthe flue 10, by maintaining a substantially constant pressure condition therein, in order to secure a satisfactory operation o-f the coke ovens. To this end, I provide near the base of the stack 11 a lateral pipe 12 communicating with the stack and provided with air-admitting open ings 13 controlled by a balanced valve 14:. The twovalve disks of this valve are preferably slightly smaller than said openings and are mounted on a stem 15 which is con nected to the bell 16 of a gas holder 17, containing liquid into which said bell l6'dips, the space beneath the bell but above the liquid being connected by a pipe 18 to the flue 10 at the point where it is desired to maintam a constantpressure condition. 5 In this case, this pressure condition is less than atmospheric pressure. The pressure condition beneath the bell 16 is the same as that in the flue 10. The rod 15 is also connected by a flexible member 19 to an arc-shaped seg. ment 20 at one end of a suitably supported" lever 21, on the other end of which there is a segment 22to which is connected another flexible member 23 from which is hung a weight 24. y V

The weight 24 tends to lift the rod 15 and move the valve disks 14 toward closed position; This tendency is opposed by the difference between the'actions of atmospheric pressure and the flue pressure on the bell 16, which difference in pressure tends to move the'rod 15 downward and the valve disks 14 to a more open position. The disks 14 of the balanced valve when not fully closed and the system is designed so that they are practically never fully closed admit air from theatmosphere into the base of the stack 11, thus diminishing the draft created inthe flue 10 and cutting downthe partial vacuum in'such flue from what it would otherwise be. The valve disks 14 take ment of the valve disks 14 continues until the. equilibrium is restored. When the draft in the flue increases so that the pressure falls (or the partial vacuum increases) 1n the fine 10, such equilibrium is disturbed in the other prevent such changes from becoming unduly large.

The arrangement shown in Fig. 2 illustrates the application of my invention to a pipe carrying a gaseous streamunder pressure greater than atmospheric pressure, whereas the arrangement shown in Fig. 1 illustrated the invention as applied to a stream in which the pressure is less than atmospheric pressure. In the arrangement of Fig. 2, the pipe 30 carries a gaseous stream from any suitable source, such as air from a blower, the stream flow being in the direction of the arrows. The pipe 30 is provided with air outlet openings 33 governed by a balanced valve 34: the disks of which are mounted 011 a rod 35. The rod 35 of this balanced valve is suitably connected, as is the balanced valve of Fig. 1, to the bell 16 of the gas holder 17 the'space beneath the bell communicating by the pipe 18 with the pipe 30 at the point where the constant pressure is desired. Here, however, the rise of the bell 16 tends to open the balanced valve, whereas in the arrangement shown in Fig. 1 such rise tends to close such balanced valve, because in the arrangement shown in Fig. 2 the desired pressure is greater than atmospheric. I prefer to connect the rod 35 and the bell 16 in the arrangement shown in Fig, 2 through the lever 21 with its segments 20 and 22 and the cooperating flexible members 19 and 23, a suitable weight 24 being placed on the bell 16 if necessary in order to obtain the desired pressure condition. In effect, the arrangement shown in Fig. 2 difi'ers from that shown in Fig. 1 in that the gas holder is transferred to the other end of the lever 21, so that it acts directly on the weight 2 instead of directly on the rod 15.

In operation, the balanced valve 34 is moved toward or from closed position to vary the leakage from the pipe 30 to the atmosphere and thus to maintain a substan tially constant pressure at that point in the pipe 30 to which the pipe 18 is connected. Upon an increase in. the pressure at this point, the bell 16 is lifted to open the valve disks 34 and permit a greater leakage from the pipe 30, thereby returning the pressure to normal. Upon a decrease in the pressure in the pipe 30 the reverse action occurs. In either movement of the valve disks 34, the movement continues until the lost equilibrium between the forces acting on the lever 21 is restored, which occurs when the desired pressure condition is reached,

I claim as my invention: 7

1. In combination, a conduit carrying a fluid stream and provided with a bleed open ing communicating therewith, a balanced valve controlling said bleed opening, a gas holder the bell of which is connected to said balanced valve to operate it, the space be neath the bell of said gas holder being connected with said conduit, and means whereby the forces acting on such bell are substantially constant save for the variations in pressure beneath it.

2.111 combination, a conduit carrying a fluid stream and provided with a bleed opening communicating therewith, a balanced i valve controlling'said bleed opening, a gas holder having a bell the space beneath which is connected with said conduit, said bell being connected to said balanced valve to opcrate it, and means whereby said valve is acted on by forces which are substantially constant save for the variations in pressure beneath the bell, said means including a lever provided at its ends with arc-shaped segments over which pass flexible members one of which is connected to saidbalanced valve.

3. In combination, a fine communicating with a stack, the conduit formed by said flue and stack being provided with a bleed opening from the atmosphere for admitting air to such conduit, a' balanced valve controlling such bleed opening, a'gas holder the bell of which is connected to said balanced valve so that when the bell rises and falls the balanced valve is moved toward and from closed position respectively, the space beneath such bell being connected to such conduit, and means whereby the forces acting on such bell and valve are substantially con stant save for variations in pressure beneath such bell.

4. In combination, a-flue connnunicating with a stack, the conduit formed by said flue and stack being provided with a bleed opening from the atmosphere for admitting air to such conduit, a balanced valve controlling such bleed-opening, gas holder the bell of which is connected tosaid balanced valve so that when the bell rises and falls the balanced valve is moved toward and from closed position respectively, the space beneath such bell being connected to *si'rch'conduit, and means whereby the forces acting on such bell and valve are substantially 'con stant save for variations in pressure beneath such bell, said means including a lever provided at its ends with arc-shaped segments over which pass flexible members one of which is connected to said valve and the ing therewith, a balanced valve comprising two rigidly connected plates cooperating with said respective bleed openings so that when one plate moves inwardly the other moves outwardly, said plates being slightly smaller than the openings with which they cooperate so that they clear the edges thereof, and means controlled by a condition of the fluid in the stream for controllingsaid balanced valve.

6. In combination, a conduit carrying a fluid stream and provided with a bleed opening communicating therewith, a balanced valve controlling said bleed opening and a gas holder the bell of which is connected to said balanced valve tooperate it, the space beneath the bell of said gas holder being connected with said conduit, and said bell and balanced valve being arranged so that the forces acting thereon include but one variable which is the pressure beneath such bell and are in equilibrium when the desired pressure condition in the fluid stream exists and tend to move the valve in a direction to restore such equilibrium when it is destroyed by a change from such desired pressure.

7. In combination, a flue communicating with a stack, the conduit formed by said flue and stack being provided with a bleed opening from the atmosphere for admitting air to such conduit, a balanced valve controlling said bleed opening, and a gas holder the bell of which is connected to said balanced valve so that when the bell rises and falls the balanced valve is moved toward and from closed position respectively, the space beneath such bell being connected with said conduit, and said bell and balanced valve being arranged so that the forces acting thereon include but one variable which is the pressure beneath such bell and are in equilibrium when the desired pressure condition within such conduit exists and tend to move the valve in a direction to restore such equilibrium when it is destroyed by a change from such desired pressure.

In witness whereof I have hereunto set my hand at Indianapolis, Indiana, this seventh day of May, A. D. one thousand nine hundred and seventeen.

WILLIAM H. WRIGHT.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, I). G. 

